Portable electric lamp



Nov. 4, 1930. w. BURNETT, JR, `1,780,779

PORTABLE ELECTRIC LAMP Filed Jan. u14, 1928 252 im* /2 /a l ATTORNEY QTI WILLIAM RURNE'IT,l JR, oRiuARIoN', ILLrNoIsnssieNoR 'ro'ivion-RRN COAL BURNER co., or CHICAGO, ILLINOIS, A coRPoRarIoNor ILLINOIS, A L

` YP oR'iuiRIJR RLR'crRIo L'Aivir Y Application fled January 14, 1928,; Serial No. 246,701,

l .The present invention relates to portableelectric Vlamps operated byy a battery and adapted to be either suspended from'some support' or to be carried in the hand.v The special use for which the present, electric lamp has been' designed is for use `as a safety lamp in' mines and the like places, where there-is danger of igniting explosive gases if an open flame or spark is permitted to come into contact with the gases. It has been generally employed as what is known as a trip-lamp-7 and 'is attached to the'edge of a mine car to indicate the presence or advance of said car in saidmine, and as a warning to others of its presence or movement in such mine. This electric lamp may also be removed from said car and carriedin the hand, Y

if desired at any time.

One of the objects of the present invention is to provide a safety lamp adapted to be easily and quickly suspended from a mine car. i

Another object is to provide such an elec'f,

tric lamp whichshall be light'in weight, and having a handle readily adapting it to be carried inthe hand.

Another vobject is to provide such an elec# tric lamp strong in construction, light in weight, simple as to part-s and unbreakable even in case of accident;

l/Vith the above and other objects in view,

which will more fully appear from the fol-' lowing specification, my invention relates to the combination of parts to provide the new and novel construction shown, and to produce the new and novel results outlined hereinafter. In the drawings forming part of this specification, I have shown one embodiment of my invention, and in said drawings, like L numerals of reference refer to the same part throughout the various views, in which,

Figure 1 is a front elevation of said electric lamp as in use. f

Figure 2 is a section view taken along the line -m of Figure 1.

The electric lamp shown in the accompanying drawings is especially adapted for use in mines, and other similar places, where there is liable to be explosive gases, which cause fire a and explosion if they are permitted to come into Contact with the flame, or any spark from the lamp. For such uses, it is imperative that the lamp shall'conformto the safety regulations?V `established forl f operating lights in mines. i

To accomplish this :resultr and to guard against any accidental exposure to danger of lire which might be caused by accidentaly breakage ofthe saidA lamp yor any of its parts, I-ha'vefmade the case'l enclosingjthe parts hereinafter described, of vvery heavy-metal, withV all of the openings securelycovered by elements attached thereto by screwthreads.y There is an opening at the bottom of the case to permit insertion-'of the battery and other parts, which openingisclosed by a cover plate 3' attached to said c'aseiby passing two rods 75 5 up through the Vcase and through holes in the top 2, and securely held in'place Aagainst the shoulder. 4 at the bottom of the case'by upper ends of said rods. A battery 8 is supported upon the cover plate-Swithin the case as shown, with its central terminal electrically connected with'the case through-the shelf- 10 as shown in Fig.- 2 andthe other terminal electrically connected by a yielding connec# 'tion 12 with the Contact plate 10, mounted upon the shelf9, and insulated therefrom by thejinsulation 11 inserted between said con-v tact-plate and said contact/plate andrsaid shelf. As best indicated inFigJl, the ends of' the plate 10 are provided with 'raised spring portions 12 and these spring portions `in said opening 15 isa lens 17 of-eXtra heavy glass to obviate danger from breakage. Said lens is also set deeply withinsaidbezel, and well protectedagainst danger of contact with objects `which might break it. Withinl the' case,l and in the rearA of the lens, is a lamp ymeans of nuts 7, 7 screw threaded upon the Y. lil

therefrom, and in'contact with the rear of the Y lens.' lVithin thesocket is mounted an elec- `triclight bulb of any usual type. To makev suitable connection between the lamp vandthe battery, theplate 14 is mounted between two insulating blocks 21 and 22.-attachedto the rear wall of the case by means ofscrews. The -forward-`block22 has anl openingr 23 therein f f Y in line with thev stem' ofV the socket 18; and adapted to permit the contact' center of said flike places, comprising a metal case open at -thebottomia vclosurefor said bottom having threaded rodsextendingthrough the top of Vsaid ease, a U^shapedfhandle,.av lens in'lthe .y

f 25 attaching the said-blocks 21and 22to the socket to contact with said plate`,`"`closing the connection with one terminal .of the battery through said plate 14, the wire 13, and the plate. 10;v The outer shell of the socket is con-y nected vwith thecase through the wirer 24 in whichjin turn is attached to'one ofthe screws wall of the case. i switch is usuallymount ed at some v'suit'ab'le'portion of oneof the `lines to permitoperation from without the case to disconnect said current whennot inuse.

' At therear of the case, attached near the top, I have provided the heavy U-shaped rod 26 kto serve as a hook for mounting said lamp on the front, side orgrear'o'f amine car; or ,fory use as y,a'handle Ito carry it in the hand,.when desired. vBy placing vsuitable aroundfthe openings: atlvthe'top, frontyand bottom, and tightening-'the cover parts down tightly against said packing,` it I'will belseenV that said case may be, closed I air tight, and

seen that.I..have provided a verycompact l electric lamp, which is very strong and dus orderiorbecomebroken. f It is small in size,

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thusf excludeA all mine gas which might otherwiseenter said case, and cause an explosion if coming into contactwith the electric current Vorany sparkstherefrom.. f

. VF romA the foregoing description,-it will `be `rabl'e,-andfhaving but few parts to get out of light 'in weight, and can easily be attachedor removed. from the'mine cars, or may be readilycarried in vonehand when desi-red. It isav perfect gsafety-lamp, for the reason Ythat all o f the parts are contained within thecase,

Y 4andthat this can `be sealedperfectly against admission of any airor'gas from without, andin useit has been found muchpreferable, and

safer-than-any of -theelectric vlamps now iny useifn-thepast. -f 1'" l Havingthus `described my invention', what I claim, and desire to secure by LettersPatent,is the following f Y 1*.V A portable safety electric lamp, compris# ing a case, a cover plate for closing thebottom thereof, threaded rods .extending from -said cover platethroughthe top of :said case, nuts 2 on` the endsof said rods, an .electric battery within saidfcase, a shelf above said battery dividingsaid case into two compartments, a

contact Yplate adjacent one terminal of said battery, a yieldable connection betweeny said terminalandsaidcontactplate, a yieldabley packing l connection between saidV case and the other Y terminal of said battery, a socket contact plate connected with said first contact plate, insulaf case, insulation between said'secondplate and the. case, arlamp socket in contact with said tion material between said firstplate and the second plate, a connection4 between said case front of said case,r a bezelisurrounding said lens,` ar reflector ad] acent said lens within Ysaid case, a lamp socket. attached to said' reflector, Y an T insulated plate for Contact with'one'ter-- minal of` said socket,a wire extending t'o the casel from the othery terminal of' saidsocket,

a battery within the case, one terminal )cone nected with the; insulated platexaforesaid, andl the other with. the case, substantially as shown' and'described." 'l f and the other'terminal of said socket, a lamp 3. A safety electric lamp comprising' 'a i metal case open at` its bottomv and separatedV into two compartments by a shelfgf'a handle on theV exterior 'of said case ,a closure for said bottom a plate on said shelf insulated there`l from; a yieldable connection'adapted to con-V l' nect one terminal of'a battery to saidfplate;

a-second plate ron the-lower side ofsaid shelf -andfconnected thereto; a second yieldable con#V nection'between theroth'er terminal of said bat flector and' lens in the upper compartment of andy substantially within saidcaSe; a socket terminaly contacting 'plate non-conductively In testimony'hereof I have -signedthe foregoing specification. 1 i WILLIAM BURNE'IIT', JR.:-

p tery and said second plate; a lamp socket, re-

v'connected to said case disposed rearwardly of 

